Wellcome Trust Major Overseas Programme, The Hospital for Tropical Diseases, Oxford University Clinical Research Unit, Ho Chi Minh City, VietnamCentre for Tropical Medicine and Global Health, Old Road Campus, University of Oxford, Oxford, United KingdomLiverpool School of Tropical Medicine, Liverpool, United KingdomLondon School of Hygiene and Tropical Medicine, London, United KingdomSchool of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan

Centre for Tropical Medicine and Global Health, Old Road Campus, University of Oxford, Oxford, United KingdomLao-Oxford-Mahosot Hospital-Wellcome Trust Research Unit, Mahosot Hospital, Vientiane, LaosLondon School of Hygiene and Tropical Medicine, London, United Kingdom

Wellcome Trust Major Overseas Programme, The Hospital for Tropical Diseases, Oxford University Clinical Research Unit, Ho Chi Minh City, VietnamCentre for Tropical Medicine and Global Health, Old Road Campus, University of Oxford, Oxford, United KingdomLondon School of Hygiene and Tropical Medicine, London, United Kingdom